(i have google translated it but please always use ENGLISH on this forum - the dev)
Powerful but expensive Adeptus Astartes warriors, with full layout (up to dreadnoughts and psykers) and stormtroopers: cheap weak meat.
The approximate composition is as follows:
Attack aircraft:
• Guys with lasguns (cost - 1, much weaker than evoks ).
• Autocannons and heavy bolter calculations (1-2 - cost, strong long-range attacks, but weak armor and health).
• Tank Leman Russ (3-4 - cost, area attacks or something similar, strong against infantry and light vehicles).
Adeptus Astartes (for all but technology - poor regeneration):
• Tactical, Devastators, Assault (cost 3-4, health less than a tank, but 2-3 times more than attack aircraft, medium, strong and armor-piercing attacks, respectively; the latter have a bit more armor, the first 2 actions).
• Terminators (4-5 cost, health almost like a tank, armor too, very strong armor-piercing attacks).
• Librarian (4-5 cost, powerful attacks, submission, area attacks, immune to submission).
• Dreadnought (6 or more cost, a huge supply of health, or strong attacks in close combat, or in distant, area 3x3).
• Tech-priest (2-3 cost, heals allies, calls for skitarii).
• Skitarii (Slightly stronger than attack aircraft).
Special Forces:
• Adeptus kustodes (the same Astartes, only 2-3 times stronger and more expensive, focused on close combat).
• Gray knights (a little weaker than Custodes, but immune to submission and can subordinate themselves, there is a long and close battle).

I do acctualy speak Russian, well kind of, but I definitely won't bother to read all of that in my third language. Additionally, there is a rule on the forum - we use English only. I cannot consider that an suggestions because of that.
Based on the reply and title, you probably want to suggest an faction like the Imperium of Man from WH40K. That's a big no-no. We can take some inspiration for the current humans, and we will, but we can't rip off any names etc. because of copyright issues. Besides, we didn't make this to be a WH game.